* {
    margin: 0;
    padding: 0;
}

body {
    background-color: rgb(47, 90, 43);
}

ul {
    list-style: none;
}

ul .daohang {
    text-decoration: none;
    font-weight: 600;
}

.nav li {
    float: right;
    height: 50px;
    font: 25px/33px '微软雅黑';
}

.logo {
    position: absolute;
    left: 80px;
}

header {
    display: block;
    position: fixed;
    left: 0px;
    top: 0px;
    width: 100%;
    z-index: 5;
    box-shadow: rgba(0, 0, 0, 0.3) 0px 4px 4px 0px;
    background-color: rgba(4, 17, 4, 0.319);
}

header a {
    color: aliceblue;
    text-decoration: none;
    display: block;
    padding: 9px 50px;
}

header a:hover {
    background-color: rgb(0 0 0 / 25%);
    padding: 9px 50px;
}

video {
    width: 100%;
    top: 0;
    left: 0;
    position: absolute;
}

.yinyue {
    height: 44px;
    width: 44px;
    margin-top: 3px;
    margin-left: 5px;
    display: inline-block;
}

audio {
    display: none;
    position: absolute;
    top: 2px;
    left: 2px;
}

.yinyue:hover #media {
    display: block;
}

.rotate {
    cursor: pointer;
    animation: rotate 10s linear infinite;
}

div audio:hover {
    animation-play-state: paused;
}

@keyframes rotate {
    from {
        transform: rotate(0deg);
    }

    to {
        transform: rotate(360deg);
    }
}

.zongbiao {
    color: rgb(59, 111, 60);
    font: 700 80px '微软雅黑';
    text-shadow: 5px 5px 3px rgb(0, 0, 0);
    position: absolute;
    top: 60px;
    left: 630px;
    z-index: 2;
}

.container {
    position: relative;
    perspective: 1600px;
    top: 356px;
    display: flex;
    justify-content: center;
    align-items: center;
}

.b {
    width: 400px;
    height: 250px;
    position: absolute;
    transform-style: preserve-3d;
    animation: a 8s infinite cubic-bezier(.7, 0, .17, 1);
}

.b div {
    position: absolute;
    background-size: cover;
    opacity: .9;
    width: 400px;
    height: 250px;
    transform: rotateY(calc(var(--i)*120deg)) translateZ(600px);
}

@keyframes a {
    0% {
        transform: translateZ(-100px) rotateY(0);
    }

    33% {
        transform: translateZ(-100px) rotateY(-120deg);
    }

    66% {
        transform: translateZ(-100px) rotateY(-240deg);
    }

    100% {
        transform: translateZ(-100px) rotateY(-360deg);
    }
}

.c {
    background-image: url(ziliao/减塑1.png);
}

.d {
    background-image: url(ziliao/减塑2.jpg);
}

.e {
    background-image: url(ziliao/减塑3.png);
}

.bigbox {
    position: absolute;
    top: 63px;
    left: 120px;
    width: 1274px;
    height: 720px;
    border-radius: 5px;
    background-color: rgba(203, 251, 201, 0.297);
    box-shadow: rgb(0 0 0 / 30%) 0px 6px 10px 4px;
    z-index: -1;
}

.shengming {
    position: absolute;
    top: 850px;
    left: 650px;
    text-align: center;
    line-height: 20px;
}